09-14-2016
I don't see the point in taking from somewhere a program, which is completely unrelated to your problem, and hoping that it will mysteriously turn into a correct run.
You should at least show some effort, for example by outlining the idea for an algorithm to do this task. At this point, this has nothing to do with shell programming; it's just about programming in general. Once this is done, we can discuss solutions in how to turn the algorithm into a, say, shell script; and, don't forget in this case to indicate, whether you are looking for a solution in some particular shell (bash, ksh, zsh, posix shell,....), or if any shell would be fine, as long as it gets the job done.
BTW, while it is for sure possible and not too hard to write the whole thing in shell language, I would probably use a more convenient programming language, such as Ruby or Perl. In the end, it's a matter of taste.
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LEARN ABOUT OPENSOLARIS
shells
shells(4) File Formats shells(4)
NAME
shells - shell database
SYNOPSIS
/etc/shells
DESCRIPTION
The shells file contains a list of the shells on the system. Applications use this file to determine whether a shell is valid. See getuser-
shell(3C). For each shell a single line should be present, consisting of the shell's path, relative to root.
A hash mark (#) indicates the beginning of a comment; subsequent characters up to the end of the line are not interpreted by the routines
which search the file. Blank lines are also ignored.
The following default shells are used by utilities: /bin/bash, /bin/csh, /bin/jsh, /bin/ksh, /bin/ksh93, /bin/pfcsh, /bin/pfksh, /bin/pfsh,
/bin/sh, /bin/tcsh, /bin/zsh, /sbin/jsh, /sbin/sh, /usr/bin/bash, /usr/bin/csh, /usr/bin/jsh, /usr/bin/ksh, /usr/bin/ksh93, /usr/bin/pfcsh,
/usr/bin/pfksh, /usr/bin/pfsh, and /usr/bin/sh, /usr/bin/tcsh, /usr/bin/zsh, and /usr/sfw/bin/zsh. /etc/shells overrides the default list.
Invalid shells in /etc/shells could cause unexpected behavior, such as being unable to log in by way of ftp(1).
FILES
/etc/shells list of shells on system
SEE ALSO
vipw(1B), ftpd(1M), sendmail(1M), getusershell(3C), aliases(4)
SunOS 5.11 20 Nov 2007 shells(4)